In honor of the 20th anniversary of the September 11th attacks, which were really that terrible, here's a special episode of Sesame Street that originally aired back then in 2002.  It was written in response to those attacks.  In this episode, Elmo takes a tour to the firehouse after being traumatized by a fire at Hooper's Store.

https://www.youtube.com/watch?v=q6Z6njK-LGs